ASTM_D_7519_-_11.pdf

Designation:D751911Standard Test Method forInternal Bond Strength and Thickness Swell of Cellulosic-Based Fiber and Particle Panels After Repeated Wetting1This standard is issued under the fixed designation D7519;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods provide a measure of the moistureresistance of cellulosic-based fiber and particle panels(forexample,medium-density fiberboard(MDF),particleboard,and hardboard).Resistance to moisture changes is measured bydimensional and internal bond changes and does not refer todecay/mold resistance or other performance aspects.1.2 These test methods do not address structural propertiesor performance following moisture exposure.Panels are sub-jected to repeated cycles of water submersion and oven drying.After three cycles,the test specimens are tested for thicknessswelling(TS)and internal bond(IB)strength.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1037 Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel MaterialsD4442 Test Methods for Direct Moisture Content Measure-ment of Wood and Wood-Base MaterialsD4933 Guide for Moisture Conditioning of Wood andWood-Based Materials3.Significance and Use3.1 These test methods provide a measure of the moistureresistance of cellulosic-based fiber and particle panels(forexample,medium-density fiberboard(MDF),particleboard,and hardboard).This test methodology can be used to assessthe thickness swelling and bond integrity characteristics ofpanels engineered for interior end-use applications involvingexposure to cyclic temperatures and intermittent wetting envi-ronments.4.Apparatus4.1 The methods and test equipment used in Test MethodsD1037 are used in these test methods.5.Sampling and Test Specimens5.1 Two samples taken from the same board measuring 6 6 in.(152 152 mm)shall be used for collection of thicknessswelling(TS)data.5.2 Three internal bond(IB)strips measuring 6 12 in.(152 305 mm)shall be cut from the same board as the TSsamples.6.Conditioning6.1 Condition specimens to practical equilibrium at a rela-tive humidity of 65 6 3%and a temperature of 68 6 4F(206 2C).Practical equilibrium is defined as the state of timechange in which,for practical purposes,the specimen isneither gaining nor losing appreciable moisture content in a24-h period.Guide D4933 provides further information onmoisture equilibrium.7.Procedure7.1 Thickness Swell(TS)7.1.1 After conditioning,the mass of the specimen shall bemeasured to an accuracy of 60.2%.The width,length,andthickness of the specimen shall be measured to an accuracy of60.3%to compute the volume of the specimen.7.1.2 The thickness shall be measured at four points mid-way along each side 1 in.(25 mm)away from the edge and theaverage of these four measurements shall be recorded as theinitial thickness for each specimen.The thickness shall bemeasured over a surface with14-in.diameter on both sides ofthe specimen using a micrometer with14-in.(6.4-mm)anvils.7.1.3 The specimens shall be submitted to three exposurecycles according to 7.2.The water soak tank parameters shall1This test method is under the jurisdiction of ASTM Committee D07 on Woodand is the direct responsibility of Subcommittee D07.03 on Panel Products.Current edition approved May 1,2011.Published June 2011.DOI:10.1520/D751911.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 conform to the requirements of paragraph 23.5.1 of TestMethods D1037.For drying,a forced air drying oven shall beused with an adequate internal volume to allow TS specimensto dry without being dead stacked.7.1.4 After the third exposure cycle,remove excess waterfrom the specimens using a paper towel and measure the finalthickness of each specimen at the four marked points midwayalong each side according to 7.1.2.7.1.5 After exposure,the specimens shall be dried in anoven at 217 6 4F(103 6 2C)to determine the moisturecontent in accordance with Test Methods D4442,Method B.7.2 Exposure CycleThe TS